Descriptive Statistics

Question 1

Descriptive Statistics

Answer 1

Describe your data, as measured
In your sample

Question 2

Inferential Statistics

Answer 2

Use your sample to make inferences about population, making decisions

Question 3

Measures of Central Tendency

Answer 3

Mean, Mode, Median

Question 4

Deviation

Answer 4

Difference between the mean and a data point

Question 5

Sum of Squared Deviations

Answer 5

Adds all deviations in a data set together and squares to fix negative findings

Question 6

Variance

Answer 6

Is the sum of squared deviations divided by n (number of data points). Issue is its in units squared

Question 7

Standard Deviation (SD)

Answer 7

Square root of Variance

Question 8

Margin of Error

Answer 8

Difference between sample mean and population mean

Question 9

Standard Error

Answer 9

SD divided by the square root of n (number of data entries). Helps show whether sample mean is usable in calculating population mean. Equivalent to 68.2% confidence intervals.

Question 10

95% Confidence Interval

Answer 10

The 95% confidence (95% CI) gives a more realistic idea of the interval likely to contain the population mean

The 95% CI is roughly twice the size of the SE

95%𝐶𝐼=±1.96 𝑆𝐷/√𝑁

the mean + the confidence interval and the mean - the confidence interval are the bands